55643447 has 4 divisors (see below), whose sum is σ = 56405760. Its totient is φ = 54881136.

The previous prime is 55643387. The next prime is 55643453. The reversal of 55643447 is 74434655.

It is a happy number.

55643447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55643447 - 2¹⁰ = 55642423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55643447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55643747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381047 + ... + 381192.

It is an arithmetic number, because the mean of its divisors is an integer number (14101440).

Almost surely, 2^55643447 is an apocalyptic number.

55643447 is a deficient number, since it is larger than the sum of its proper divisors (762313).

55643447 is an equidigital number, since it uses as much as digits as its factorization.

55643447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762312.

The product of its digits is 201600, while the sum is 38.

The square root of 55643447 is about 7459.4535322636. The cubic root of 55643447 is about 381.7725293404.

The spelling of 55643447 in words is "fifty-five million, six hundred forty-three thousand, four hundred forty-seven".